Oracle-L: RE: View HELP Please!

From: Nick Wagner <Nick.Wagner_at_quest.com>
Date: Wed, 12 Feb 2003 10:59:15 -0800
Message-ID: <F001.0054B025.20030212105915@fatcity.com>

I remember some parameter about Query re-writes... it may be only for Materialized Views... but could be the culprit here.

Also, do you have Oracle Label Security set on this table, or Fine-Grain Auditing?

-----Original Message-----
Sent: Wednesday, February 12, 2003 8:29 AM To: Multiple recipients of list ORACLE-L

Ron, man, you got me on the version thing. I yell at people who don't say what version they are on, and here I am forgetting to do the same. I'm on 9iR2.

You are correct that the view would not use the index if I just did a select * from it with no additional predicates. However, if I do a select * from a view with a predicate in that select statement (like user_id=100) then the additional predicate should be merged into the view and a new execution plan (using index lookup) should be generated.

Thanks!

-----Original Message-----
To: Multiple recipients of list ORACLE-L Sent: 2/12/2003 10:04 AM

Robert,
I will make the assumption that you are on a newer version of Oracle.

If I remember correctly, a view does not use an index and will use a full table scan. That could be the cause for the time difference. I know that this doesn't answer your question but it might trigger other thoughts that solve the problem.
Ron

>>> FREEMANR_at_tusc.com 02/12/03 10:18AM >>> I'm fighting a view.... Someone hand me a big dagger with which to kill it.
I have a view that takes 6 minutes to run when I query it like this:

select
count(*) from TST_XVW a
where claim_carrier_key=41721;

Yet, if I take the SQL from the view, add the claim_carrier_key predicate to
it, I get a run time of 6 seconds. I've tried several different hints (push_pred, use_nl, etc) and I'm just not seeming to be able to get the
optimizer to give me a good plan. Any help on this would be appreciated.

Robert
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Author: Nick Wagner
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